Grinding machine



Nov. 27, 1934. F. s. HAAS GRINDING MACHINE Filed May 12, 1932 5 Shets-Sheet 1 NOV. 27, 1934. F. s HAAS 1,982,298

GRINDING MACHINE Filed M y 12, 1952' s Sheets-Sheet 2 Nov. 27, 1934. F. s. HAAS GRINDING MACHINE Filed May 12, 1932 5 Sheets-Sheet 5 m FM NOV. 27, 1934. s HAAS 1,982,298

GRINDING MACHINE Filed May 932 5 Sheets-Sheet 4 Patented Nov. 27, 1934 UNETED STATES PATENT OFFICE,

GRINDING MACHINE Frederick S. Haas, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated; Cincinnati, Ohio, a corporation of Ohio Application May 12, 1932, Serial No. 610,837

16 Claims; (01. 51-103) This invention relates to improvements in machine tools and especially to improvements in grinding machines of the centerless 'type. 1

An object of the invention is the provision of 8 improved means for supporting and guiding a work piece through the throat of a centerless grinder.

Another object of the invention is the provision H of improved means adjustable through a plurality of planes of adjustment for adapting the machine for grinding all sizes of work pieces within the range thereof.

A further object of the invention is the provision of variable adjustable guides, work rest, and

overhead shoe for use with a centerless grinder between the opposed grinding and regulating wheels thereof for adapting the machine for operation on a plurality of sizes and types of work pieces.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification, considered in conjunction with the accompanying drawings, forming a part thereof, and it is to be understood that any modifications may be made in the exact structural details there shown and described within the scope of the appended claims without departing from or exceeding the spirit of the invention.

In the drawings:

Figure 1 is a side elevation of a grinding machine embodying the improvements of this invention.

Figure 2 is a front elevation of the machine shown in Figure l and as particularly seen by looking directly into the grinding throat Figure 3 is a transverse sectional view through the grinding throat and as seen substantially from line 33 on Figure 1. j

Figure 4 is a sectional view taken on line 4-4 of Figure 3. I

Figure 5 is a sectional view taken substantially on line 5-5 of Figure 2.

Figure 6 is a sectional view taken substantially on line 6--6 of Figure 5.

Figure 7 is a sectional view taken substantially on line 7-? of Figure 6.

Figure 8 is a fragmentary sectional view taken on line 8-8 of Figure 3.

Figure 9 is a fragmentary sectional view taken cn line 9-9 of Figure 3.

Throughout the several views of the drawings similar reference characters are employed to denote the same or similar parts.

As shown in Figure 1, the machine is provided with an operative surface extending at an acute angle to the vertical and'comprises a bed 10 having formedalong this acute angle guideways 11 for a grinding wheel carriage 12 to guide same in its movement relative to the bed. The carriage 12 has journaled therein a spindle 13 to one end of which is secured a grinding wheel 14. Secured to the spindle 13 is a pulley 15 having trained thereabout a belt or other flexible transmission 16 in turn extending about a pulley secured to a countershaft 17 carried by an arm 13 journaled on a shaft 19 supported by the bed 10. The shaft 17 is provided with a second pulley about which extends a belt or other flexible transmission 20 in turn journaled about apulley or sheave 21 secured to the motor or motor shaft 22 of the electric motor orother prime mover 23. This motor 23 is suitablysupported by a bracket 24 formed integral with. or positioned interiorlyiof the bed 10. The motor 23 through the flexible transmissions or belts 20 and 16 is adapted to rotate the spindle 13 and grinding wheel 14' at a high grinding rate of speed in a clockwise direction as indicated by the arrow associated therewith.

In order to shift the grinding wheel carriage 12 and grinding wheel 14 relative to the guideways 11, it has depending from it a lug or arm 25 in which is journaled a nut 26 in threaded engagement with an adjusting screw 2'7 fixed against axial movement relative to the bed as by bearings 28 and 29. Secured to or integral withthe nut 26 is a worm wheel 30 meshing with a worm 31 on the end of the shaft 32 extending through and carried by the guide 12. The shaft 32 has on its outer end a hand wheel 33 whereby it is rotated for effecting the relative adjustment of the carriage 12. i The grinding wheel 14 is enclosed within a suitable guard or housing 34 forming a guideway 35 for a truing tool or the like 36 adapted to be traversed across the active face of the grinding wheel to maintain same inla true, sharp condition.

The bed 10 is further provided along itsoperative inclined surface with a housing or bracket 37 to which is secured a head 38 enclosing a spindle, carrying on its one end a regulating wheel 39. The regulating wheel 39 and its spindle are adapted to be rotated during the grinding operation at a relatively slow work rotation controlling rate of speed in a clockwise direction as indicated by the arrow associated therewith. The regulating wheel has its operative surface spaced a predetermined distance from the operative face of the grinding wheel 14 for thereby forming a grinding throat of a size representative of the final size of the work being ground. In order to maintain the active face of the regulating wheel in a true, sharp condition, the head 38 has secured thereto a bracket 40 for guiding a truing mechanism 41 while being traversed across the operative face of the regulating wheel.

The bed 10 is provided intermediate the part to which the bracket 3'7 is attached and the guideways 11, with a boss 42 on which is formed a dove-tailed guide tongue 43 received in a similarly shaped guideway 44 formed in a bracket or block 45. The block 45, as shown in Figures 6 and '7, has journaled therein a shaft 46 having formed on its inner end a pinion 47 meshing with the teeth of a rack 48 secured to the dovetailed guide 43. A gib 49 is interposed between one side of the guide 43 and the adjacent side of the guideway. 44 for taking up all play or lost motion that. may exist between said parts. The" gib being adjustable for varying its position and being adapted to be locked in adjusted position by means ofa sliding clamp 50 abutting on one end with one face of the gib and on the other end with a'screw 51-threaded into the block or carriage 45.

The outer end of the shaft 46 is provided with a worm wheel 52 meshing with a worm 53 formed integral withor secured to the worm shaft-54. This shaft 54 is journaled in a housing or boss 55 secured to the outer surface of the block or carriage 45. The end 56 of the worm shaft54 is of angular cross section for the reception of a suitable crank or the like and whereby the worm shaft may be rotated. From this it will be seen that rotation of the worm 53 will cause the rotation of the shaft 46 causing the rack pinion to advance along the rack 48 and carry with it the block or carriage 45 for positioning same relative to the bed and the grinding throat. The carriage 45 is provided at its forward end with an upstanding flange 5'7 through which is "formed elongated perforations 58 for bolts 59 which enter a block 60 for clamping said block in adjusted positions relative to the flange 5'7. The means for adjusting this block 60 relative to the flange 5'7 will be described in detail later. The block 60 is adapted to have secured therein a blade 61 carrying as at 62 a wear strip or spot of hard material which is provided with an inclined operative surface 63 inclined in the general direction of the operative surface of the regulating wheel forming therewith a work receiving trough in which the work piece to be operated upon is mounted or positioned. The blade 61 is secured in the'block 60 by means of clamp screws or bolts 64 extending through one side thereof into engagement withthe blade 61, which in actual practice is positioned in a slot or pocket 65 formed in the upper end of the block 60. To prevent dirt, grit, coolant or the like from having access to the boss or lug 42 when the carriage 45 is advanced to its forward end, but which, when the carriage is retracted, rides upthe forward face of said lug and overlies the operative surfaces of the guide andway 43 and 44. To prevent the above menthe block is further provided with a flexible shutter 68 secured at one end to the block 60 and guide 90.

having its other end received in a pocket 69 formed on the outer face of the guard 6'7.

From this it will be seen that the carriage guideway is effectively protected from the usual coolant and grit normal with grinding machines to thereby increase the accuracy and life of said guides.

As was noted above, the work rest blade 61 has an inclined operative surface 63 inclining in the general direction of the operative surface of the regulating wheel and forms therewith a work receiving trough. In alignment with the operative face of the wheel for guiding the work to the blade and receiving the work therefrom as it passes beyond the grinding throat, there is provided guide plates 70 and 71 respectively mounted at the forward and rear ends of the throat. The guide plates and their supporting and adjusting mechanisms are identical and it deemed sufficient if but one of them be described in detail. The guide plate '70 its upper and lower edges beveled as at '72 and 73 in Figure 5. The beveled edge 72 of the plate "7 3 is received in the correspondingly beveled ways 7% formed in the lower ends of arms '75 and Vii-integral with a bracket or support '77. The bracket or support 77 has formed intermediate its bounds an inclined counterbore 78 and a threaded perforation '79 in axial alignment with the bore '78. The axis of the bore "[8 and perforation '19 extends in a direction that is normal to the inclined edge 73 of the plate '70. A relatively large headed screw 80 is threaded into the perforation '79 utilizing the under flat surface of the head 81 thereof to engage with the bevel surface '73 for forcing the plate '76 into the ways '74 formed in the arms '75 and '75 for securing said plate in desired guiding position.

In order to adjust the bracket '77 and plate '70 to maintain alignment of the said plate with the operative face of the regulating wheel, as when the said wheel is worn or trued down, the bracket '77 has formed integral therewith a sleeve 82 extending into a cylindrical guide formed integral with or secured to the head 38. The sleeve 78 has at one end an enlarged counterbo-re 83 pro viding a shoulder 84 against which is seated the adjacent surface of a collar 85 formed on an adjusting screw 86 that extends through the sleeve 82. One end of the screw 86 projects beyond the bracket '77 and has secured thereto a knob 8'7 vertent movement of the sleeve 82 relative to the guide 90, it has mounted therein a clamp screw 91 for securing the sleeve 82 and parts associated therewith in adjusted positions.

To prevent oscillatory movement of the bracket 7'7, as about the axis of the sleeve 82, the said bracket has projecting from it a guide stem 92 which passes through a guide boss 92- formed integral with or secured to the cylindrical It is frequently desirable to adjust the guide plates to dispose the guiding surfaces thereof at an angle to the plane of extent of the operative face of the regulating wheel; this adjustment being also advantageous to correct for slight machining errors and to very minutely adjust the parts for correct work production. For this rea- 153 son, the bracket 77, see Figures 3 and 4, has

form the base against which the guide plate is forced by the clamping screw 80. The said wedge screws 94 and 95 have each projecting from its rear surface a pin 97 extending into a guide slot 98 formed in the body of the bracket 77 to prevent rotative movement of the wedge screws relative thereto. The bracket 77 is provided on opposite surfaces near the upper edge with slots 99 and 100 in each of which is disposed a nut 101 and 102 in threaded engagement with the wedge screws 94 and 95. In the event it is desired to elevate one or the other end of the guide plate 70, the clamp screw 80 is first loosened and then the proper nut 101 or 102 rotated for shifting its screw axially of the bracket 77 and thereby either raising or lowering the said end of the guide plate 70.

In order to insure the work being properly steadied and guided while in the grinding throat, there is provided a blade or shoe 103 engaging with the work at a point substantially diametri cally opposed to the point of contact of the work with the angle top 63 of the blade 61. The shoe 103, as seen in Figure 5, is connected by means of cap screws 104i and 105 to'a block 106 having formed on its inner end a guide tongue 107 received in guide groove 108 formed along the adja cent face of support arm 109. It will be noted that the operative surface of the arm 109 is inclined toward the grinding wheel so that adjustment of the block 106 along this surface will cause the shoe 103 to remain in a normal position relative to the axis of the work while approaching or receding the operative faces ofthe wheels. This adjustment is utilized'when different diameters of work pieces are to be ground by the machine. For example, if a work piece of a diameter less than that illustrated in Figure 5 were to be operated upon, the block 106 would be actuated downwardly toward the left as respects the operative surface of the arm 109. This would cause the shoe not only to be lowered vertically toward the axis of the work, but also to be ad'- justed toward the left since a smaller work piece would have its axis shifted toward the left, as seen in Figure 5. It being understood, of'course, that the work rest blade 61 would be adjusted to take care of the different sizes of work pieces in a vertical direction, as will be described in detail later, and toward the regulating wheel.

- The block 106 is secured in its several adjustable positions by means of cap screws or the like 110 which extend through a slot 111 formed in the upper end of the arm 109. The other end of the arm 109 is also provided with a groove 112 through which clamp screws 113 and 114 extend for securing the arm to the work rest block 60. By this construction the arm 109 may be adjusted relative to the block 60 for disposing the shoe 103 in proper position relative to the work.

In order to vertically adjust the work rest blade I 61, the block 60 is shifted relative to the flange 57 together with all the parts carried by this block. Accordingly, the block has journaled therein the opposite ends of a screw 115 having screw threads 116 formed intermediate its ends. A nut 117 is provided in threaded'engagement with the screw 116 havin extending from opposite sides thereof wings 118 and 119 received in a socket 120 formed in one end of a carriage, 121. The carriage 121 is disposed within a comparatively large cavity 122 formed interiorly of the block 60. The carriage further abuts on its upper surface 123 with the adjacent under surface of the cavity 122. Rotationof the screw 115 will through the threaded portion 116 axially shift the nut 117,which through its engagement by it means of the wings 118 and 119 with the carriage 121 axially shifts the said carriage relative to the block 60. r

The carriage 121 has formed therein diagona grooves or slots 124 and 125 receiving therein the reduced inclined cam nose portions 126 and 127 of lifting screws or plugs 128. From this it will be seen that as the carriage 121 is axially adjusted a camming action will take place between the cams 126 and 127 and the sides of the cam grooves 124 and 125, thereby moving the carriage vertically in an inclined direction as it is moved along, but moving the block 60 and parts carriedthereby in a vertical direction only.

To insure the vertical movement I only of the block 60, it has projecting from it a pin 129 which extends into the vertical groove 130 formed in the adjacent surface of the flange 57.

Itis believed that from the foregoing description the several adjustments of the support, guides and overhead shoe will be readily understood and that there has been provided a centerless grinder capable of universal adjustment for taking care of various sizes and types of work pieces without the necessity of removing the parts from the machine and substituting other parts therefor.

What is claimed is: I l 1. In a centerless grinder the combination 0 a bed, a pair of-opposed grinding and regulating wheels carried thereby and forming a grinding lthro'at therebetween, a work rest blade carried by the bed beneath the grinding throat, a housing for one of the wheels, guide plates carried by the housing having their operative surfaces disposed in parallel alignment with the operative surface of said wheel, and means for adjusting the position of the guide plates to dispose the said operative surfaces thereof at an angle to the operative face of the wheel and out of parallelism therewith. r

2. In a centerless grinder the combination of a bed, a pair of opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a work rest blade carried by the bed beneath the grinding throat, a housing for one of the wheels, guide plates carried by the housing having their operative surfaces aligned with the operative surface of said wheel, andmeans for adjusting the position of the guide plates to dispose the said operative surfaces thereof out of alignment with the. wheel, said adjusting means including a bracket for each guide of the guide plates and bracket toward and from the wheel housing, comprising a sleeve extending from the bracket, a guide on the housing for the sleeve, and an adjusting screw in operative connection with the bracket sleeve and housing guide.

3. In a centerless grinder the combination of a bed, a pair of opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a work rest blade carried by the bed beneath the grinding throat, a housing for one of the wheels, guide plates carried by the housing having their operative surfaces aligned with the operative surface of said-wheel, means for adjustingthe position of the guide plates to dispose the said operative surfaces thereof out of alignment with the wheel, said adjusting means including a bracket for each guide, plate and adjusting members carried by the bracket, and means for adjusting the position of the guide plates and bracket toward and from. the wheel housing, comprising a sleeve extending from the bracket, a guide on the housing for the sleeve, an adjusting screw in operative connection with the bracket sleeve and housing guide, and cooperating means carried by the bracket and housing for holding the bracket andsleeve against movement about the axis of the bracket sleeve.

4. A work rest unit for use with oenterless grinders comprising a carriage mounted upon the grinder bed for translation relative thereto, a block cairied by the carriage for adjustment relative thereto, means for securing the block in adjusted positions relative to the carriage, and a work rest blade mountedon the block, said means for adjusting the block relative to the carriage comprising a screw rotatably journaled in the block, a nut on the screw, a member associated with the block and movable relative thereto by means of the nut, and co-operating cams associated with the member and carriage whereby movement of the member effects its transverse adjustment. I

5. A work rest unit for use with oenterless grinders comprising a carriage mounted upon the grinder bed for translation relative thereto, a block carried by the carriage for adjustment relative thereto, means for securing the block in adjusted positions relative to the carriage, and a work rest blade mounted on the block, said means for adjustingthe block relative to the carriage comprising a screw rotatably journaled in the block, a nut on the screw, a member ESSOCi-r ated with the block and movable relative thereto by means of the nut, and co-operating cams associated with the member and carriage whereby movement of the member effects its transverse adjustment, said co-operating cams comprising cam slots formed in the member, and fixed cams projecting from the carriage into operative engagement with the cam slots.

6. An adjustable work support and overhead guide for use with a oenterless grinder comprising a carriage mounted on the grinder bed, a supporting block secured to the carriage for movement relative thereto and therewith, a work rest blade supported by the block for supporting a work piece while being operated upon, an overhead guide substantially diametrically opposed to the work rest blade, an arm mounted on the block for adjustment relative thereto and therewith, and an operative coupling between the overhead guide and arm.

7. An adjustable work support and overhead guide for use with a oenterless grinder comprising a carriage mounted on the grinder bed, a supporting block secured to the carriage for movement relative thereto and therewith, a work rest blade supported by the block for supporting a work piece while being operated upon, an overhead guide substantially diametrically opposed to the work rest blade, an arm mounted on the block for adjustment relative thereto and therewith, and an operative coupling between the overhead guide and arm, said coupling comprising a guide on the arm disposed at an angle to the general extent of the arm whereby adjustment of the overhead guide varies thevertical and lateral relationship between the said overhead guide and work rest blade.

8. In a grinding machine of the class described the combination of a bed, a pair of opposed grinding and regulating wheels mounted ,on the bed and forming a grinding throat therebetween, one of said wheels being fixed and the other being movable to vary the size of the grinding throat,

a carriage on the bed'beneath the grinding throat s for movement relative thereto, a work rest blade mounted on the carriage for movement therewith toward and from the operative faces of the grinding and regulating wheels, an overhead guide substantially diametrically opposed to the work rest r blade, means securing the guide to the carriage for movement therewith, and additional means for adjusting the position of the guide relative to the carriageto vary its operative position relative to the wheels and laterally of the grinding throat.

9. In a grinding machine of the class described the combination of a bed, a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade disposed beneath the grinding throat for supporting a work piece insimultaneous engagement with the operative faces of the wheels, lateral guides for guiding the work to the throat and from the throat, comprising guide plates, a bracket for each plate, means carried by each bracket at each end of the plates for independently adjusting the ends of the plates to align same with the operative face of the grinding wheel, and means for locking the said plates in adjusted position.

10. In a grinding machine of the class described the combination of a bed, a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade disposed beneath the grinding throat for supporting a work piece in simultaneous engagement with the operative faces of the wheels, lateral guides for guiding the work to the throat and from the throat, comprising guide plates, a

bracket for each plate, means supporting the 1-.

posed grinding and regulating wheels forming a 11 grinding throat therebetween, a work rest blade disposed beneath the grinding throat for supporting a work piece in simultaneous engagement with the operative faces of the wheels, lateral guides for guiding the work to the throat and from the throat, comprising guide plates, a bracket for each plate, means supporting the plates for independent adjustment to align same with the operative face of the grinding wheel,

means for locking the said plates in adjusted position, and means for disposing the operative face of said guide plates at an angle to the plane of extent of the wheel with which they are associated, said means comprising wedge-shaped members associated with each bracket and forming a base for the guide plate, and means for independently adjusting the wedge members.

12. In a oenterless grinder of the class described the combination of a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade subtending the grinding throat and having an inclined operative surface, inclining toward the regulating wheel and forming between them a work receiving trough, an overhead shoe contacting with the work at a point to hold the work in the trough, and means supporting said overhead shoe whereby a single adjustment causes it to approach the work rest blade and simultaneously shift laterally of the throat.

13. In a centerless grinder of the class described the combination of a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade subtending the grinding throat and having an inclined operative surface, inclining toward the regulating wheel and forming between them a work receiving trough, an overhead shoe contacting with the work at a point to hold the work in the trough, means supporting said overhead shoe whereby a single adjustment causes it to approach the work rest blade and simultaneously shift laterally of the throat, said supporting means including an arm having an inclined surface inclining laterally with respect to the grinding throat.

14. In a work supporting mechanism for use with a centerless grinder the combination of a bed, a carriage mounted thereon for movement relative thereto, a work rest block carried by the carriage for adjustment relative thereto, a work rest blade secured in the block to partake of the movement thereof, an overhead shoe, means securing the overhead shoe to the work rest block whereby it may be adjusted with the block and work rest blade and whereby it may be adjusted independently of the block and blade to vary the distance between the blade and shoe, and additional means for independently adjusting the shoe relative to the supporting means toward the blade and laterally with respect thereto.

15. In a work supporting mechanism for use with a centerless grinder the combination of a bed, a carriage mounted thereon for movement relative thereto, a work rest block carried by the carriage for adjustment relative thereto, a work rest blade secured in the block to partake of the movement thereof,-an overhead shoe, means securing the overhead shoe to the Work rest block whereby it may be adjusted with the block and work rest blade and whereby it may be adjusted independently of the block and blade to vary the distance between the blade and shoe, additional means for independently adjusting the shoe relative to the supporting means toward the blade and laterally with respect thereto, said means including an arm capable of adjustment with respect to the block to effect an adjustment of the shoe relative to the blade and block, and co-operating inclined guideways on the shoe and arm whereby the shoe is independently adjusted relative to the arm toward and from the blade and laterally with respect thereto.

16. In a work supporting unit for use with centerless grinders the combination of a bed, a carriage mounted thereon for translationrelative thereto, a rack carried by the bed, a rack pinion in operative engagement with the rack and rotatably supported by the carriage, a Worm and worm wheel mechanism carried by the carriage for effecting the operation of the rack, a block adjustably secured to the carriage, an adjusting screw rotatably journaled in the block, a nut on the screw, an axially shiftable member carried by the block in operative engagement with the nut whereby movement of the nut correspondingly axially shifts the member, a cam slot,

FREDERICK S. HAAS. 

